Improvement in bolt-threading dies



. 2-Sheets--Sheetl.

H. H. MORGAN. Bolt-Threading Dies.

N0.155,840. Patented Oct.13,1874

Fig L 2Sheets--Sheet2 I H. H. MORGAN. Bolt-Threading Dies. N0.l55,840.Patented 0ct.13,1874.

UNITED STATES PATENT OFFICE.

HUGH H. MORGAN, OF RAVENNA, OHIO.

IMPROVEMEhIT m BOLT-THREADING cuss.

Specification forming part of Letters Patent No. 155,840, dated October13,1874; application filed April 22, 1874.

To all whom it may concern:

Be it known that I, HUGH H. MORGAN, of Ravenna, in the county of Portageand State of Ohio, have invented certain Improvements in Machines forCutting Threads on Metallic Bolts, of which the following is aspecification:

The nature and object of this invention is a bolt-threading machine inwhich the dies are made to open or recede from the bolt after it isthreaded so as to permit it to be withdrawn. This is done by means of asliding collar, which is grooved to hold the outer ends of the die, sothat by sliding the collar on the hollow shaft through which the diespass the dies are opened and closed. The principal features of noveltyare, first, the manner of holding the sliding collar in position whilethe dies are threading the bolt, and also the adjustment of the dies tocompensate for wear dies; second, the device for opening the t res.

In the drawings, Figure 1 is a vertical view of the machine. Fig. 2represents the front end of the machine. Fig. 3 is a horizontal sectionof the machine. Fig. 4 is a section of the sliding collar, showing thegrooves which gold the dies. Fig. 5 represents one of the res.

ais the frame which holds the revolving hollow shaft b. Near the frontend of the hollow shaft round holes are drilled through it, in which thedies 0 c c c are fitted, so that no face-plate is required. The slidingcollar 61 on the hollow shaft 1) is groovedto hold the dies near theirouter ends. The grooves c c c e are made across the sliding collar (11.The outer ends of the dies and the parts of the grooves c c e c whichare in contact with the ends of the dies are at an angle to the axis ofthe cutter-head. The shape of the grooves is shown in Figs. 2 and 4. Theparts of the dies which project outside of the hollow shaft b are madeto fit these grooves, which prevent the dies from turning in thecutter-head. One

. side of each die, at its outer end, projects into the part of thegroove 6, shown at t, by means of which the end of the die is kept incontact with the bottom of the groove, and as it is at an angle to theaxis of the cutter-head, when the sliding collar (1 is moved forward onthe hollow shaft 1) the dies approach each other, and when the slidingcollar is moved back the dies are opened. Around in the outside of thering f, on the hollow shaft, just back of the sliding collar (1, is agroove, into which the pins 9 g in the lever h project. The lever Itpasses around the rin g f, and the pins g gproject through the leverinto the groove of the ring f at the top and bottom of the ring. One endof lever h is loosely pinned to the frame, and the other end of thelever is a handle. The outside of the hollow shaft 1) is grooved lengthwise to receive the spring it, one end of which is attached to the frontend of the hollow shaft 1). the inside to receive the spring k. There isa shoulder on the outside of spring It, just back of the sliding collard, when the dies are closed, which prevents the sliding collar (1 fromsliding back' while the dies are cutting, by means of the screw oradjustable stop I. The screw or stop l passes through the collar 61, andits head presses against the shoulder of the spring It, thus holding thecollar d in position while the dies are cutting. The top of the springit, back of the ring f, is inclined toward the axis of the cutter-head,and projects from the hollow shaft 1) while the dies are cutting. Oneend of the spiral spring .9 is attached to the outside of the hollowshaft b,.back of the ring f, and the other end is attached to thesliding collar d, the spring passing loosely through a hole in theringf. The spiral spring 8 draws back the collar d to open the dies whenthe spring 70 is pressed into the groove of the 1101- low shaft b, sothat its shoulder is not in contact with the screw-stop I. The pin 0passes loosely through a hole in the collar d, and is screwed into theside of the ring f. It is used for the same purpose as the spiral spring8 in case the spring 8 should fail at any time to draw back the collar dand open the dies. For this purpose there is a shoulder in the hole inthe collar 01, against which the head of the pin 0 presses when thecollar d is drawn back. The collar 01 and ringf revolve with the hollowshaft b.

The machine is operated as follows: When the dies are closed to thread abolt, by turning the screw-stop l in the collar d, as the head of thescrew-stop lpresses against the The ring f is also grooved across springis, when the spiral spring 8 draws back the collar d, and thus opens thedies and releases the bolt.

pressing'back the lever h untilthe head of the pin 0 presses against theshoulder in the hole through collar 61 and draws back the collar. Byturning the screw-pin 0 in the ring fit is adjusted so that its headwill not press against collar 01 until the spring 70 is pressed down bythe ring f to permit the collar d to be drawn back. To close the diesagainst the bolt the In case the spiral spring s fails to draw back thecollar d, it is done by" handle of the lever h is movedforward,'pressing therin g f against the stop I, and thereby sliding thecollar (1 forward which closes the dies, and at the same time permitsthe spring 70 to rise into the groove in the ring f until the shoulderof the spring 70 is against the end of the stop I.

I claim as my invention- 1. The grooved sliding collar d, in combinationwith the spring 70 and hollow shaft 11, substantially as and for thepurpose herein set forth. r p v I 2'. The spring 70, in combination withthe hollow shaft 1), the stop l,'the sliding collar cl. and the ring f,substantially as and for the purpose herein set forth.

HUGH H. MORGAN.

Witnesses BRADFORD HowLAND, GEORGE F. RoBINsoN.

